How to use the pyuvsim.astropy_interface.SkyCoord function in pyuvsim

5.099, 3.162, 1.414, 3.162, 5.099, 7.071, 7.280,
                        5.385, 3.606, 2.828, 2.236, 2.236, 2.828, 3.606, 6.325])

        alts = 90. - zas
        Nsrcs = alts.size
        fluxes = np.ones_like(alts)

    catalog = []

    if isinstance(array_location, MoonLocation):
        localframe = 'lunartopo'
        mock_keywords['world'] = 'moon'
    else:
        localframe = 'altaz'
        mock_keywords['world'] = 'earth'
    source_coord = SkyCoord(alt=Angle(alts, unit=units.deg), az=Angle(azs, unit=units.deg),
                            obstime=time, frame=localframe, location=array_location)
    icrs_coord = source_coord.transform_to('icrs')

    ra = icrs_coord.ra
    dec = icrs_coord.dec
    names = np.array(['src' + str(si) for si in range(Nsrcs)])
    stokes = np.zeros((4, 1, Nsrcs))
    stokes[0, :] = fluxes
    catalog = pyradiosky.SkyModel(names, ra, dec, stokes, 'flat')
    if return_data:
        catalog = SkyModelData(catalog)
    if get_rank() == 0 and save:
        np.savez('mock_catalog_' + arrangement, ra=ra.rad, dec=dec.rad, alts=alts, azs=azs,
                 fluxes=fluxes)

    return catalog, mock_keywords